Guide to Aircon Cleaning in Hong Kong

Maintaining a clean air conditioning unit is essential in Hong Kong due to the hot, humid climate and high usage of aircon systems. Regular cleaning improves efficiency, reduces energy costs, and prevents mold and bacteria buildup, which is critical in a densely populated city with high air pollution. This guide provides step-by-step instructions for cleaning a wall-mounted aircon unit, tailored to Hong Kong residents.

Why Clean Your Aircon in Hong Kong?

• Humidity and Mold: Hong Kong’s subtropical climate (average humidity 70–80%) promotes mold and mildew growth inside aircon units.

• Dust and Pollution: Urban air quality, with PM2.5 levels often exceeding WHO guidelines, leads to dust accumulation in filters.

• Energy Efficiency: A clean unit can reduce energy consumption by up to 15%, saving on electricity bills in a city where aircon use accounts for 30% of household energy.

• Health: Dirty aircons can circulate allergens, bacteria, and odors, worsening respiratory issues, especially for children and the elderly.

Tools and Materials Needed

• Screwdriver (for removing panels)

• Soft brush or vacuum with brush attachment

• Aircon cleaning spray or coil cleaner (available at hardware stores like Japan Home Centre)

• Mild detergent (e.g., dish soap)

• Spray bottle with water

• Clean cloths or microfiber towels

• Bucket or tray to catch drips

• Gloves and face mask (optional, for hygiene)

• Fin comb (optional, for straightening bent fins)

• Aircon cleaning bag (optional, for containing water and debris)

Safety Precautions

• Turn Off Power: Always switch off the aircon unit at the circuit breaker to avoid electric shock.

• Ventilation: Ensure the room is well-ventilated to avoid inhaling cleaning chemicals or dust.

• Protect Surroundings: Cover furniture and floors with plastic sheets or towels to catch drips.

Step-by-Step Cleaning Guide

1. Turn Off and Unplug the Unit

• Switch off the aircon at the remote and the main power supply.

• If accessible, unplug the unit or ensure the circuit breaker is off.

2. Remove and Clean the Air Filters

• Open the front panel of the aircon unit (consult your manual for specific instructions).

• Remove the air filters (usually 1–2 mesh filters).

• Vacuum loose dust with a brush attachment or rinse under running water with mild detergent.

• Gently scrub with a soft brush if stains persist. Avoid hot water to prevent warping.

• Let filters air-dry completely (4–6 hours) in a shaded area to avoid UV damage.

3. Clean the Cooling Coils and Fins

• Locate the cooling coils behind the filters (shiny metal surfaces).

• Spray with an aircon coil cleaner (e.g., WD-40 Specialist Air Conditioner Cleaner, available at Mannings or Watsons).

• Let the cleaner sit for 5–10 minutes to loosen dirt.

• Wipe gently with a damp cloth or rinse with a spray bottle (use low pressure to avoid damaging fins).

• Use a fin comb to straighten any bent fins for better airflow.

• Place a bucket or cleaning bag under the unit to catch runoff.

4. Clean the Fan and Interior

• Use a damp cloth with mild detergent to wipe the fan blades and interior surfaces.

• Avoid excessive water to protect electrical components.

• For stubborn dirt, use a soft brush or compressed air canister (available at Fortress or Broadway).

5. Clean the Exterior and Drainage Tray

• Wipe the exterior panel with a damp cloth and mild detergent.

• Check the drainage tray (below the coils) for mold or clogs. Clean with a cloth or flush with water.

• Ensure the drain pipe is clear to prevent leaks, common in Hong Kong’s high-rise flats.

6. Reassemble and Test

• Once all parts are dry, reattach the air filters and close the front panel.

• Turn on the power and run the aircon in fan mode for 10–15 minutes to dry internal components.

• Check for unusual noises or leaks, which may indicate a need for professional servicing.

How Often to Clean

• Filters: Every 2–4 weeks, depending on usage and dust levels (more frequent in urban areas like Kowloon or Central).

• Coils and Interior: Every 3–6 months for regular maintenance.

• Professional Servicing: Annually, especially before summer (May–September), to ensure optimal performance.

Hong Kong-Specific Tips

• Local Retailers: Purchase cleaning supplies at Japan Home Centre, Mannings, or Watsons. Online options include HKTVmall for delivery.

• Professional Services: If DIY cleaning is not feasible, hire licensed technicians via platforms like HelloToby or OneSoho. Expect costs of HKD 400–800 per unit.

• Regulations: In Hong Kong, improper disposal of cleaning chemicals can violate environmental laws. Dispose of waste responsibly at designated collection points (e.g., Sai Kung or Tuen Mun recycling stations).

• High-Rise Challenges: For window or wall units in high-rise flats, ensure safety when accessing external components or hire professionals with proper equipment.

When to Call a Professional

• Persistent odors or poor cooling after cleaning.

• Unusual noises (e.g., rattling or grinding).

• Refrigerant leaks or electrical issues (e.g., unit not powering on).

• Complex systems (e.g., ducted or multi-split units) requiring specialized tools.

Maintenance Tips

• Run the aircon in fan mode for 10–15 minutes after use to dry moisture and prevent mold.

• Set the temperature to 25–26°C for energy efficiency, as recommended by Hong Kong’s Electrical and Mechanical Services Department (EMSD).

• Use a dehumidifier alongside the aircon in humid months (March–June) to reduce strain on the unit.

Resources

• EMSD Guidelines: Visit emsd.gov.hk for energy-saving tips and aircon maintenance advice.

• Local Forums: Check GeoExpat or AsiaXpat for community tips on reliable aircon technicians in Hong Kong.

• Product Manuals: Refer to your aircon’s manual (often available online via brands like Mitsubishi, Daikin, or Panasonic) for model-specific instructions.

Regular cleaning ensures your aircon runs efficiently, saving money and keeping your home comfortable in Hong Kong’s demanding climate.